4-(4-Carboxy-1,3-thiazol-2-yl)pyridinium 3-carboxy-4-hydroxybenzenesulfonate dihydrate

Abstract

In the crystal structure of the title compound, C9H7N2O2S+·C7H5O6S−·2H2O, an H atom from the 5-sulfosalicylic acid is transferred to the pyridyl N atom, forming a salt. The dihedral angle between the thiazole and pyridinium rings is 5.909 (5)°. The crystal packing is determined by O—H...O and N—H...O hydrogen bonds involving water molecules.